. >> we gave her about 60 units of narcan. >> narcan can reverse an overdose from heroin and other drugs like oxycodone. >> liz? >> another sternal rub, another shot of narcan. >> let's go ahead and give her some more narcan. >> giving her the rest of this whole cc. >> and finally, liz begins to come to. >> liz? you okay? you went out. mouth to mouth without hesitation. we're giving you some narcan. you overdosed. can you sit up? >> yeah. >> all right, come on. >> when someone takes heroin, the drug locks on to receptors in the brain. it slows the body down. lock up too many, and you stop breathing. narcan can free up those receptors, essentially bringing you back to life. you might wonder, that video of liz, is that real? we showed it to four emergency room doctors who all said, yes, this is what a recovery with narcan looks like. >> i can't believe that somebody cared about me enough or, you know, loved me enough to bring me back. >> back to right a life that somehow went wrong. we met liz on the day she checked into rehab, packing up her things, taking another look at the album of her